Epoxy Curing Agents and Modifiers - …

1 Epoxy Curing Agents and Modifiers Ancamide 2050 Curing agent DESCRIPTION Ancamide 2050 Curing agent is a special polyamide adduct designed for use with liquid Epoxy resins in two-part, ambient-cure coatings. ADVANTAGES Good cure at 50 F Good corrosion resistance High aqueous acid and Skydrol (A) resistance Zero induction time at ambient temperature Moderate viscosity Good flexibility High-gloss finish Noncritical loading (70 100 phr) APPLICATIONS High-solids marine and maintenance coatings High-solids lining coatings High-solids primers and coatings for concrete Sealants and putties STORAGE LIFE At least 24 months from the date of manufacture in the original sealed container at ambient temperature. Store away from excessive heat and humidity in tightly closed containers. HANDLING PRECAUTIONS Refer to the Material Safety Data Sheet for Ancamide 2050 Curing agent .

2 TYPICAL CURE SCHEDULE 7 days at ambient temperature. (A) Monsanto Company TYPICAL PROPERTIESA ppearance Clear, Amber LiquidColor1 (Gardner) 7 Viscosity2 @ 77 F (cP) 4,000 Specific Gravity3 @ 77 F Value4 (mg KOH/g) 225 Flash Point5 (closed cup) ( F) >200 Equivalent Wt/{H} 150 Recommended Use Level (phr, EEW=190) 70 TYPICAL HANDLING PROPERTIES* 70 phr 100 phrMixed Viscosity2 @ 77 F (cP) 6,400 5,000 Gel Time6 (150g mix @ 77 F) (min) 100 80 Thin Film Set Time7 @ 77 F (hr) Exotherm8 (100g mix @ 77 F) (min) 95 104 Peak Exotherm Time8 (min) 136 133 TYPICAL PERFORMANCE* (7 days @ 77 F)Glass Transition Temperature9 ( F) 108 Heat Deflection Temperature10 ( F) 108 90* Ancamide 2050 Curing agent formulated with standard Bisphenol-A based (DGEBA, EEW=190) Epoxy resin. Footnotes: (1) ASTM D 1544-80 (2) ASTM D-445-83, Brookfield, RVTD, Spindle 4 (3) ASTM D 1475-85 (4) Perchloric Acid Titration (5) Seta Flash Closed Cup (6) Techne GT-4 Gelation Timer (7) BK Drying Recorder (8) ASTM D 2471-71 (9) ASTM D 3418-82 (10) ASTM D 648 @ 264 psi Air Products and Chemicals, Inc.

3 , 7201 Hamilton Boulevard, Allentown, PA 18195-1501 Tel: (800) 345-3148, (610) 481-6799, Fax: (610) 481-4381, The information contained herein is offered without charge for use by technically qualified personnel at their discretion and risk. All statements, technical information and recommendations contained herein are based on tests and data which we believe to be reliable, but the accuracy or completeness thereof is not guaranteed and no warranty of any kind is made with respect thereto. Pub. No. 125-9436 Page 2 SUPPLEMENTARY DATA Formulations Exhibits 1 and 2 show formulations for an aluminized Epoxy mastic and an anticorrosive primer based on Ancamide 2050 Curing agent . Handling Properties Table 1 compares the handling properties of Ancamide 2050 Curing agent and a conventional polyamide such as Ancamide 350A Curing agent . The low viscosity of the Ancamide 2050 Curing agent allows formulators to develop high-solids coatings with lower VOC.

4 Ancamide 2050 Curing agent has excellent resistance to blush and exudation, so an induction time is not necessary at ambient temperature. Pot life for Ancamide 2050 Curing agent is less than that of Ancamide 350A Curing agent , but is still sufficient. The aluminized mastic and anticorrosive primer formulations in Exhibits 1 and 2 have pot lives of 5 hours and 8 hours, respectively. The comparative dry times at ambient and low temperature for Ancamide 2050 and Ancamide 350A Curing Agents are also shown in Table 1. At ambient temperature, Ancamide 2050 Curing agent has a tack-free time of 6-7 hours, depending on use level (100 vs 70 phr) compared with 11 hours for Ancamide 350A Curing agent . At 50 F, the tack-free time of Ancamide 2050 is 19-24 hours vs 36 hours for Ancamide 350A Curing agent . Table 1 Handling Properties Ancamide 2050 Ancamide 350A Viscosity (cP) 4,000 11,000 Mixed Viscosity (cP) 5,000-6,400 18,600 Pot Life (min) 80-100 200 Tack Free (hr @ 72 F) 6-7 11 Tack Free (hr @ 50 F) 19-24 36 Use Level (phr) 70 100 60 Curing Agents were mixed with liquid Epoxy (EEW=190) at use levels indicated.

5 The full formulations in Exhibits 1 and 2 have dry to touch times of hours and dry through times of 9-10 hours at ambient temperature. Page 3 Film Properties Table 2 shows comparisons of flexibility, gloss, VOC and film appearance for Ancamide 2050 and Ancamide 350A Curing Agents . Formulators can use Ancamide 2050 Curing agent to achieve superior flexibility by taking advantage of its noncritical loading, and by increasing its use level to 100 phr. Table 2 Film Properties Ancamide 2050 Ancamide 350A Direct Impact (in/lb) 500 EEW resin (a) 44 52 400 EEW resin (a) 38 33 300 EEW resin (a) 20 20 200 EEW resin (a) 20 12 Reverse Impact (in/lb) (b) 12/110 <20 1/8 in Mandrel bend (b) Pass Pass Gloss (60 ) (c) 100 90 VOC (lb/gal) (d) Film Appearance (e) 1 day, 77 F, 50% RH Clear, tack-free 1 day, 50 F, 90% RH Haze, tacky 1 day, 40 F, 80% RH Clear, very tacky 7 days, 50 F, 90% RH Haze, tack-free 7 days, 40 F, 80% RH Clear, tacky (a) Pigmented formulations with usage of 70 phr for Ancamide 2050 and 60 phr for Ancamide 350A.

6 (b) With liquid Epoxy (EEW=190), with Ancamide 2050 being used at 70 phr and 100 phr, respectively. Ancamide 350A is used at stoichiometry. Film thickness 10 mils DFT. Measured per ASTM 2794. (c) Pigmented formulations based on solid Epoxy resin (EEW=325) were mixed with each Curing agent , applied to cold rolled steel panels (5) (5 mil DFT) and cured 7 days at 72 F before testing. (d) In pigmented liquid Epoxy resin (EEW=190) at stoichiometry. (e) Unpigmented formulations with liquid Epoxy resin (EEW=190). Ancamide 2050 at 70 phr has comparable flexibility to Ancamide 350A. When Ancamide 2050 Curing agent 's use rate increases to 100 phr, reverse impact in a liquid Epoxy formulation increases from 12 in-lbs to 110 in-lbs. Gloss is superior to Ancamide 350A, and Ancamide 2050 can achieve lower VOC in similar formulations compared with Ancamide 350A Curing agent .

7 Films utilizing Ancamide 2050 Curing agent also have very good appearance over a range of temperature and humidity conditions. Page 4 Corrosion Resistance The aluminized Epoxy mastic and anticorrosive primer formulations shown in Exhibits 1 and 2 were evaluated for salt spray resistance and humidity resistance after 1000 hours of exposure. Both formulations performed very well as detailed in Tables 3 and 4. Table 3 Salt Spray Resistance - Ancamide 2050 General Corrosion Scribe Corrosion Field Blistering Blister Size Aluminum Mastic 10 9 6 Red Primer 10 9-10 5% salt spray, cabinet temperature 95 F ASTM B-117, film thickness mils. Rating: 10 = Best; 0 = Worst Table 4 Humidity Exposure - Ancamide 2050 General Corrosion Blistering Degree Blister Size Blanching Aluminum Mastic 10 10 10 None Red Primer 10 10 10 None Continuous 100% Humidity Exposure ASTM D-2247, cabinet temperature 122 F, film thickness mils.

8 Rating: 1=Best, 0=Worst Adhesion The Ancamide 2050-based primer and aluminum mastic formulations were evaluated for adhesion to heavy, hot rolled steel per ASTM D-4541, Pull-Off adhesion. Panels were blasted to an SSPC-SP5 white metal quality with a mil profile of mils. Greater than 400 psi was required to cause failure, and all failures occurred in the adhesive. No cohesive failure in the coating nor adhesive failure at any interface was observed. Both formulations showed good results. Chemical Resistance Table 5 contains chemical resistance data for Ancamide 2050 Curing agent . Evaluations of Ancamide 2050 at 70 phr and 100 phr with standard liquid bisphenol A Epoxy resin (EEW=190) in immersion conditions were made. Improved results are seen at the 70 phr use level compared with the higher loading. Overall, Ancamide 2050 Curing agent shows good resistance after 28 days to 10% acetic acid, Skydrol, 70% sulfuric acid and deionized water.

9 Performance is not as good for solvents and alcohols. In a comparison with several representative reagents, Ancamide 2050 out-performed Ancamide 350A Curing agent . Page 5 Table 5 Reagent Immersion Time (Days) Ancamide 2050 (70 phr) Ancamide 2050 (100 phr) Ancamide 350A (60 phr) Deionized Water 1 3 7 28

10 70% Sulfuric Acid 1 3 7 28 10% Acetic Acid 1 3 7 28 Skydrol LD-4 1 3